I have a couple of questions with a back story I’ll TRY to keep short.
The other day I was trying to remove a few bits of hair and crap that had ended up on the corrector plate of my scope. Now, I know all about cleaning only when absolutely necessary. I have a severe case of OCD
and made every mistake imaginable with my previous scope. Upon buying my new CPC1100 last year I told myself I was going to have to deal with my condition or end up making the same mistakes with a far more expensive piece of equipment. So far, I have done pretty well, as before I would have had the thing in pieces cleaning every possible part.
Anyway, while very gently brushing the stray bits with my very soft brush I’ve spread a blob of (unseen at the time) something sticky /greasy. My lovely wife went to Jaycar yesterday to get me some isopropyl alcohol and the gentleman there asked what it was for. My wife said it was for a telescope and his reply was that IPA should not be used on glass. Although I was pretty sure this was not correct I quickly re-read some online tutorials on cleaning and found on the Starzonia site a comment about IPA possibly staining newer type coatings on corrector plates.
https://starizona.com/acb/basics/using_cleaning.aspx
So finally my questions.
1. Is the Starzonia comment true about newer coatings being stained by isopropyl alcohol?
2. More importantly, I’m using cotton wool with a mix of about 50 / 50 IPA (99%) to distilled water and the spot is being quite stubborn to remove, smearing all over. I’m having to go over it quite a few times (very gently). Is going over it so many times doing any damage?
in advance.